From: klu2 <klu2@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Fri, 12 Jan 2007 06:20:33 +0000 (+0000)
Subject: Correct the right bits judgment for get size of OptionROM.
X-Git-Tag: edk2-stable201903~23641
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=9a037c5d09715245dc349dac05679dce53c8931f

Correct the right bits judgment for get size of OptionROM.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2236 6f19259b-4bc3-4df7-8a09-765794883524
---

diff --git a/EdkModulePkg/Bus/Pci/PciBus/Dxe/PciOptionRomSupport.c b/EdkModulePkg/Bus/Pci/PciBus/Dxe/PciOptionRomSupport.c
index 3ec76989a5..449d0dc443 100644
--- a/EdkModulePkg/Bus/Pci/PciBus/Dxe/PciOptionRomSupport.c
+++ b/EdkModulePkg/Bus/Pci/PciBus/Dxe/PciOptionRomSupport.c
@@ -64,7 +64,7 @@ Returns:
   PciRootBridgeIo = PciIoDevice->PciRootBridgeIo;
 
   //
-  // offset is 48 if is not ppb
+  // offset is 0x30 if is not ppb
   //
 
   //
@@ -112,15 +112,16 @@ Returns:
   if (EFI_ERROR (Status)) {
     return Status;
   }
-
-  AllOnes &= 0xFFFFFFFC;
-  if ((AllOnes == 0) || (AllOnes == 0xFFFFFFFC)) {
+  //
+  // Bits [1, 10] are reserved
+  //
+  AllOnes &= 0xFFFFF800;
+  if ((AllOnes == 0) || (AllOnes == 0xFFFFF800)) {
     return EFI_NOT_FOUND;
   }
 
   PciIoDevice->RomSize = (UINT64) ((~AllOnes) + 1);
   return EFI_SUCCESS;
-
 }
 
 EFI_STATUS